EM-1422

Testing for a right angle

E Math · Secondary 3 · Medium · Testing for a right angle

1. Yes, because $9^2 + 40^2 = 41^2$.
2. Yes, because $9 + 40 = 41$.
3. No, because $9^2 + 41^2 \neq 40^2$.
4. No, because $9 + 40 + 41 \neq 90$.

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